DE2600582A1 - Two-step heating of thermoplastics film or sheet - by first contact heating to below shaping temp. and then by e.g. infrared radiation to shaping temp. - Google Patents
Two-step heating of thermoplastics film or sheet - by first contact heating to below shaping temp. and then by e.g. infrared radiation to shaping temp.Info
- Publication number
- DE2600582A1 DE2600582A1 DE19762600582 DE2600582A DE2600582A1 DE 2600582 A1 DE2600582 A1 DE 2600582A1 DE 19762600582 DE19762600582 DE 19762600582 DE 2600582 A DE2600582 A DE 2600582A DE 2600582 A1 DE2600582 A1 DE 2600582A1
- Authority
- DE
- Germany
- Prior art keywords
- heating
- film
- temp
- film web
- heated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
- B29C51/422—Heating or cooling of preforms, specially adapted for thermoforming to produce a temperature differential
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
PATENTBESCHRE IBUNG PATENT DESCRIPTION
Verfahren und Vorrichtung zur Erwärmung thermoplastischer Folie Die Erfindung betrifft ein Verfahren zur Erwärmung thermoplastischer sowie thermoelastischer Folie in Thermoformautomaten, welche von der Materialrolle arbeiten, sowie die Vorrichtung zur Realisierung der erfindungsgemäßen Anordnung.Method and device for heating thermoplastic film The invention relates to a method for heating thermoplastic and thermoelastic Foil in thermoforming machines, which work from the roll of material, as well as the device for realizing the arrangement according to the invention.
Die Verarbeitung von thermoplastischer Folie im automatischen Arbeitsablauf kann wie folgt beschrieben werden.The processing of thermoplastic film in an automatic workflow can be described as follows.
Die Folie wird in Form einer Rolle auf einem Lagerbock vor der Maschine aufgelegt, mit Hilfe eines Transportsystems in eine stationär aufgebaute Heizstation geführt, nach dem Erwärmen einer Formstation zugeführt, in welcher die Formung der Folie zu Formteilen erfolgt. Anschließend erfolgt im taktweisen Betrieb der Weitertransport in eine Stanzstation und abschließend in eine Stapelstation. Fallweise werden die Teile mittels Form-Stanzwerkzeugen auch ausgetrennt.The film is in the form of a roll on a bearing block in front of the machine placed in a stationary heating station with the help of a transport system out, fed after heating to a molding station in which the molding of the Foil is made into molded parts. Subsequently, further transport takes place in intermittent operation in a punching station and finally in a stacking station. In some cases the Parts can also be separated using form punching tools.
Es ist üblich, daß die Folienbahn noch vor dem Einführen in den Bereich der Heizstation von dem Transportsystem erfaßt wird. Zur Verfügung stehen Nadelketten, welche die Folie beidseits am Rand mit Nadeln perforiert und so zwangsläufig die Mitnahme herbeiführen. Für Folienarten, die entweder zu dick sind oder bei denen während der Erwärmung Spannungen frei werden, kommt ein aufwendigeres System, und zwar die Klemmung der beiden Spannränder mit Hilfe federbelasteter Spannkluppen oder Leisten zur Anwendung.It is common for the web of film to be placed in the area before it is inserted the heating station is detected by the transport system. Needle chains are available, which perforates the film on both sides at the edge with needles and so inevitably the Bring take away. For types of film that are either too thick or where During the heating process, tensions are released, a more complex system comes along, and the clamping of the two tensioning edges with the help of spring-loaded tensioning clips or strips to use.
Die Folienbahn läuft in das geöffnete Maul der Spannkluppe ein, welche sich durch Federbelastung nach der Umlenkung schließt und das Material solcher Art festhält. Frei werdende Spannungen vermögen nicht das Material aus der Kluppe-zu reissen; entstehender Foliendurchhang wird, dem Stand der Technik entsprechend, durch Schrägstellen der Transportschienen ausgeglichen. Es hat sich jedoch in der Praxis gezeigt, daß diese Maßnehmen, namentlich bei der Verarbeitung von Polyolefinfolien, insbesondere Polypropylen, nicht ausreichen. Der Durchhang bei normaler Verarbeitung kann derart groß werden, daß die Folienbahn entweder ungleich beheizt wird, oder aber durch die vergrößerte Materialoberfläche während der Formung Faltungen ergibt, die nicht oder nur mit großem technischen Aufwand beseitigt werden können. The film web runs into the open mouth of the clamp, which closes by spring loading after the deflection and the material of this kind holds on. Tensions that are released are not able to pull the material out of the clip tear; resulting film sag is, according to the state of the art, compensated by inclining the transport rails. However, it has become in the Practice has shown that these measures, especially when processing polyolefin films, especially polypropylene, are not sufficient. The slack in normal processing can be so large that the film web is either heated unevenly, or but results in folds due to the increased material surface during molding, which cannot be eliminated or can only be eliminated with great technical effort.
Ein weiterer Nachteil der beschriebenen Anordnung ist, daß die Folienbahn im Bereich der ganzen Formfläche, also auch im Abfallgitter die nahezu gleiche Formtemperatur hat. Dies führt dazu, daß das Abfallgitter, welches ja in der Originaldicke erhalten bleibt und dessen Abkühlung den größten Zeitaufwand erfordert, die Arbeitsgeschwindigkeit bestimmt.Another disadvantage of the arrangement described is that the film web almost the same mold temperature in the area of the entire mold surface, i.e. also in the waste grate Has. This leads to the fact that the waste grid, which is preserved in the original thickness remains and its cooling requires the greatest expenditure of time, the working speed certainly.
Das Verfahren zur Beheizung thermoplastischer Folie ist nun derart aufgebaut, daß die Beheizung in zwei Schritten erfolgt oder aber die Folienbahn während des Heizvorganges eine partielle Abschirmung erfährt. Die Erfindung ist im Nachfolgenden anhand einer vereinfachten Schemazeichnung beschrieben.The procedure for heating thermoplastic film is now like this built up that the heating takes place in two steps or the film web is partially shielded during the heating process. The invention is described below using a simplified schematic drawing.
Fig. 1 zeigt die Längsdarstellung eines Formautomaten zur Durchführung des Verfahrens mit unterschiedlicher Beheizung in zwei Heizzonen. Fig. 1 shows the longitudinal representation of an automatic molding machine for implementation of the process with different heating in two heating zones.
Fig. 2 zeigt die Längsdarstellung eines Thermoformautomaten zur Durchführung des Verfahrens nach dem System partieller Abdeckung. Fig. 2 shows the longitudinal representation of a thermoforming machine for implementation of the partial coverage system.
Fig. 3 zeigt die Anordnung der partiellen Abdeckung in der Draufsicht Der Formautomat zur Durchführung des Verfahrens besteht vorerst in serienmäßiger Anordnung aus Rollenlagerung 1, Transportvorrichtung 2, eine Heizstation 3 und einer Formstation 4. Fig. 3 shows the arrangement of the partial cover in plan view The automatic molding machine for carrying out the process is initially in series Arrangement of roller storage 1, transport device 2, a heating station 3 and a Forming station 4.
Wie bisher üblich, wird die Folienbahn 5 durch die Transporteinrichtung 2 taktweise in der Länge des jeweils benötigten Vorschubschrittes abgezogen. Es ist das Wesen der Erfindung, daß die Erwärmung der Folien in zwei Schritten erfolgt.As has been customary up to now, the film web 5 is transported by the transport device 2 subtracted cyclically in the length of the required feed step. It the essence of the invention is that the heating of the films takes place in two steps.
In der Zone A wird die Folienbahn mit Hilfe von Kontaktheizplatten 6 und darauf angeordneten, dem Formteil entsprechenden Zwischenstücken 7 erwärmt. Das heißt, die Folie wird in dieser Zone nur an den Stellen, die nachträglich der Verformung unterworfen werden, erwärmt und zwar bis zu einer Temperatur, die unterhalb des Formungsbereiches liegt. Die Heizzone A kann nun einen oder mehreren Vorschubtakten entsprechen. Als nächstes wird die partiell erwärmte Folienbahn einem Strahlungs-Heizkörper 8 zugeführt, der ebenfalls in der Regel einem oder mehreren Arbeitstakten entsprechen kann. Die Folie wird hier weiter aufgeheizt und zwar so, daß die partiell bereits vorgewärmten Bereiche der Folienbahn, die gewünschte Formungstemperatur erhalten. Das restliche Material nimmt ebenfalls Strahlungswärme auf, wird dadurch elastisch und schmiegsam, bleibt jedoch unter dem Erweichungspunkt, so daß ein Freiwerden von Spannungen oder ein Durchhängen der Folienbahn vermieden wird. Die Folienbahn kann somit im nächsten Arbeitstakt einwandfrei in die Transportstation transportiert werden. Der Abkühlvorgang, welcher sich in der Formstation an den Formungsprozeß anschließt, kann durch die geringeren Temperaturen des dicken Stanzgitters und der geringeren Wärmemenge, die abgeführt werden muß, kürzer gehalten werden.In zone A, the film web is heated with the help of contact heating plates 6 and intermediate pieces 7 arranged thereon and corresponding to the molded part are heated. This means that the film is only used in this zone at the points that are subsequently Are subjected to deformation, heated to a temperature below of the forming area. The heating zone A can now have one or more feed cycles correspond. Next, the partially heated film web is a radiant heater 8, which also usually correspond to one or more work cycles can. The film is further heated here in such a way that the partially already preheated areas of the film web to receive the desired molding temperature. The rest of the material also absorbs radiant heat, making it elastic and pliable, but remains below the Softening point so that a release of tension or sagging of the film web is avoided. The film web can therefore be properly transported to the transport station in the next work cycle be transported. The cooling process that takes place in the forming station at the Forming process is followed by the lower temperatures of the thick lead frame and the smaller amount of heat that has to be dissipated can be kept shorter.
In Fig. 2 ist aus der Schemazeichnung ersichtlich, daß der bereits beschriebene Effekt auf eine billigere, wenn auch nicht so exakte steuerbare Methode, erreicht werden kann. Die Heizzone 3 ist mit serienmäßigen Strahlungsheizkörpern bestückt. Hier bezieht sich der Umfang der Erfindung darauf, daß zwischen die beiden Heizkörper und die Folienbahn Blenden 9 eingeschoben werden. Diese sind derart ausgebildet, daß die darin enthaltenen Durchbrüche dem Bereich der zu verformenden Folienbahn entsprechen. Die Art und Form der Ausnehmungen wird jeweils empirisch bestimmt. Die Blenden bestehen aus temperaturbeständigem Material, beispielsweise Aluminium und können bei Bedarf mit einem Medium, beispielsweise Wasser oder Öl temperiert werden. Dadurch, daß ein bestimmter Anteil der Strahlung an die Blende weitergegeben und von dieser in einem bestimmten Maß an die Folienbahn abgestrahlt wird, ist der Folienzuschnitt, der nach Abschluß der Beheizung in die Formstation eintransportiert wird, so beheizt, daß der Bereich, welcher der vollen Strahlung unterworfen war, die Formtemperatur aufweist, während die abgedeckten Teile unterhalb des Er weichungspunktes liegen.In Fig. 2 it can be seen from the schematic drawing that the already described effect on a cheaper, if not so precisely controllable method, can be reached. Heating zone 3 is equipped with standard radiant heaters equipped. Here the scope of the invention relates to that between the two Radiator and the sheet of film diaphragms 9 are inserted. These are designed in such a way that that the openings contained therein correspond to the area of the film web to be deformed correspond. The type and shape of the recesses is determined empirically in each case. The panels are made of temperature-resistant material, for example aluminum and, if necessary, can be tempered with a medium, for example water or oil will. Because a certain proportion of the radiation is passed on to the diaphragm and is radiated from this to a certain extent on the film web, is the Foil blank, which is transported into the forming station after heating is complete is heated so that the area that was subjected to full radiation, the mold temperature, while the covered parts below the He softening point lie.
Dadurch wird auch hier der Durchhang der Folienbahn vermieden und die erforderliche Wärmeabfuhr beim Kühlvorgang vermindert. Während der erfindungsgemäßen Anordnung nach Fig. 1 nach dem Gesichtspunkt des Energieverbrauches optimal aufgebaut ist und ganz klare und exakte übergangszonen zwischen den unterschiedlich erwärmten Folienbereichen zuläßt, ist das Verfahren nach Fig. 2 mit geringeren Mitteln realisierbar und an jeden Thermoformautomaten, der in herkömmlicher Bauweise mit Strahlungsheizkörpern ausgerüstet ist, nachrüstbar.This also avoids the sagging of the film web here and the required heat dissipation during the cooling process is reduced. During the invention The arrangement according to FIG. 1 is optimally constructed from the point of view of energy consumption is and very clear and exact transition zones between the differently heated Permits film areas, the method according to FIG. 2 can be implemented with fewer resources and to every thermoforming machine that has a conventional design with radiant heaters is equipped, can be retrofitted.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762600582 DE2600582A1 (en) | 1976-01-09 | 1976-01-09 | Two-step heating of thermoplastics film or sheet - by first contact heating to below shaping temp. and then by e.g. infrared radiation to shaping temp. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762600582 DE2600582A1 (en) | 1976-01-09 | 1976-01-09 | Two-step heating of thermoplastics film or sheet - by first contact heating to below shaping temp. and then by e.g. infrared radiation to shaping temp. |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2600582A1 true DE2600582A1 (en) | 1977-07-14 |
Family
ID=5967183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19762600582 Withdrawn DE2600582A1 (en) | 1976-01-09 | 1976-01-09 | Two-step heating of thermoplastics film or sheet - by first contact heating to below shaping temp. and then by e.g. infrared radiation to shaping temp. |
Country Status (1)
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DE (1) | DE2600582A1 (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0146700A2 (en) * | 1983-10-06 | 1985-07-03 | Servichem AG | Device for manufacturing of articles from a web of a thermoplastic sheet and its use for producing parts of containers |
DE3608583A1 (en) * | 1986-03-14 | 1987-09-17 | Illig Maschinenbau Adolf | Device for producing vessels or packagings by thermoforming a sheet web |
DE3836788C1 (en) * | 1988-04-25 | 1989-08-31 | Paul Kiefel Gmbh, 8228 Freilassing, De | Apparatus for preheating plastic films |
EP0435234A2 (en) * | 1989-12-28 | 1991-07-03 | Idemitsu Petrochemical Co., Ltd. | Process for thermoforming thermoplastic resin sheet and apparatus therefor |
DE4005972A1 (en) * | 1990-02-26 | 1991-08-29 | Tetra Pak Gmbh | DEVICE FOR DRAWING AN OPEN SHELL |
DE4028587C1 (en) * | 1990-09-08 | 1991-10-02 | R + S Stanztechnik Gmbh, 6050 Offenbach, De | Plate shaped heating device - includes channels for flowing agent and heatable surface, useful for moulding flat thermoplastic components |
DE4028589A1 (en) * | 1990-09-08 | 1992-03-12 | Roeder & Spengler Stanz | Handling and holding jig for heat forming thermoplastics - has adjustable needle grippers which penetrate workpiece |
WO1996032244A1 (en) * | 1995-04-12 | 1996-10-17 | Veikko Jehkinen | Deep-drawing apparatus for polymer products |
US5571473A (en) * | 1989-12-28 | 1996-11-05 | Idemitsu Petrochemical Co., Ltd. | Process for thermoforming thermoplastic resin sheet |
WO2002014050A2 (en) * | 2000-08-11 | 2002-02-21 | Visteon Global Technologies, Inc. | High volume production of low permeation plastic fuel tanks using parallel offset twinsheet pressure forming |
DE19603974B4 (en) * | 1996-01-26 | 2004-05-19 | Udo Prof. Dr.-Ing. Hellwig | Process for deforming bodies and material webs |
WO2009143810A1 (en) * | 2008-05-29 | 2009-12-03 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. | Method and heating device for thermoforming |
DE102013214592A1 (en) * | 2013-07-25 | 2015-01-29 | Universität Stuttgart | Method and device for thermoforming of plastic products |
-
1976
- 1976-01-09 DE DE19762600582 patent/DE2600582A1/en not_active Withdrawn
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0146700A2 (en) * | 1983-10-06 | 1985-07-03 | Servichem AG | Device for manufacturing of articles from a web of a thermoplastic sheet and its use for producing parts of containers |
EP0146700A3 (en) * | 1983-10-06 | 1985-11-06 | Servichem Ag | Device for manufacturing of articles from a web of a thermoplastic sheet and its use for producing parts of containers |
US4778372A (en) * | 1983-10-06 | 1988-10-18 | Servichem Ag | Thermoplastic web conveying mechanism and thermoforming apparatus |
EP0305714A2 (en) * | 1983-10-06 | 1989-03-08 | Servichem AG | Device for moulding articles made of thermoplastic material |
EP0305714A3 (en) * | 1983-10-06 | 1989-09-06 | Servichem AG | Device for moulding articles made of thermoplastic material |
DE3608583A1 (en) * | 1986-03-14 | 1987-09-17 | Illig Maschinenbau Adolf | Device for producing vessels or packagings by thermoforming a sheet web |
DE3836788C1 (en) * | 1988-04-25 | 1989-08-31 | Paul Kiefel Gmbh, 8228 Freilassing, De | Apparatus for preheating plastic films |
US5571473A (en) * | 1989-12-28 | 1996-11-05 | Idemitsu Petrochemical Co., Ltd. | Process for thermoforming thermoplastic resin sheet |
EP0435234A2 (en) * | 1989-12-28 | 1991-07-03 | Idemitsu Petrochemical Co., Ltd. | Process for thermoforming thermoplastic resin sheet and apparatus therefor |
EP0435234A3 (en) * | 1989-12-28 | 1992-04-01 | Idemitsu Petrochemical Co. Ltd. | Process for thermoforming thermoplastic resin sheet and apparatus therefor |
US5158786A (en) * | 1990-02-26 | 1992-10-27 | Tetra Pak Holdings & Finance S.A. | Apparatus for deep drawing an open bowl |
AU639299B2 (en) * | 1990-02-26 | 1993-07-22 | Tetra Pak Holdings S.A. | Apparatus for deep drawing an open bowl |
DE4005972A1 (en) * | 1990-02-26 | 1991-08-29 | Tetra Pak Gmbh | DEVICE FOR DRAWING AN OPEN SHELL |
DE4028587C1 (en) * | 1990-09-08 | 1991-10-02 | R + S Stanztechnik Gmbh, 6050 Offenbach, De | Plate shaped heating device - includes channels for flowing agent and heatable surface, useful for moulding flat thermoplastic components |
DE4028589A1 (en) * | 1990-09-08 | 1992-03-12 | Roeder & Spengler Stanz | Handling and holding jig for heat forming thermoplastics - has adjustable needle grippers which penetrate workpiece |
WO1996032244A1 (en) * | 1995-04-12 | 1996-10-17 | Veikko Jehkinen | Deep-drawing apparatus for polymer products |
DE19603974B4 (en) * | 1996-01-26 | 2004-05-19 | Udo Prof. Dr.-Ing. Hellwig | Process for deforming bodies and material webs |
WO2002014050A2 (en) * | 2000-08-11 | 2002-02-21 | Visteon Global Technologies, Inc. | High volume production of low permeation plastic fuel tanks using parallel offset twinsheet pressure forming |
WO2002014050A3 (en) * | 2000-08-11 | 2002-05-02 | Visteon Global Tech Inc | High volume production of low permeation plastic fuel tanks using parallel offset twinsheet pressure forming |
US6969485B2 (en) | 2000-08-11 | 2005-11-29 | Visteon Global Technologies, Inc. | High volume production of low permeation plastic fuel tanks using parallel offset twinsheet pressure forming |
WO2009143810A1 (en) * | 2008-05-29 | 2009-12-03 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. | Method and heating device for thermoforming |
DE102013214592A1 (en) * | 2013-07-25 | 2015-01-29 | Universität Stuttgart | Method and device for thermoforming of plastic products |
DE102013214592B4 (en) * | 2013-07-25 | 2020-03-05 | Universität Stuttgart | Method and device for thermoforming plastic products |
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